pjs/editor/libeditor/base/InsertElementTxn.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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* The Original Code is mozilla.org code.
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* The Initial Developer of the Original Code is
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* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#include "InsertElementTxn.h"
#include "nsISelection.h"
#include "nsIContent.h"
#include "nsIDOMNodeList.h"
#include "nsReadableUtils.h"
#ifdef NS_DEBUG
static PRBool gNoisy = PR_FALSE;
#endif
InsertElementTxn::InsertElementTxn()
: EditTxn()
{
}
NS_IMETHODIMP InsertElementTxn::Init(nsIDOMNode *aNode,
nsIDOMNode *aParent,
PRInt32 aOffset,
nsIEditor *aEditor)
{
NS_ASSERTION(aNode && aParent && aEditor, "bad arg");
if (!aNode || !aParent || !aEditor)
return NS_ERROR_NULL_POINTER;
mNode = do_QueryInterface(aNode);
mParent = do_QueryInterface(aParent);
mOffset = aOffset;
mEditor = aEditor;
if (!mNode || !mParent || !mEditor)
return NS_ERROR_INVALID_ARG;
return NS_OK;
}
NS_IMETHODIMP InsertElementTxn::DoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy)
{
nsCOMPtr<nsIContent>nodeAsContent = do_QueryInterface(mNode);
nsCOMPtr<nsIContent>parentAsContent = do_QueryInterface(mParent);
nsString namestr;
mNode->GetNodeName(namestr);
char* nodename = ToNewCString(namestr);
printf("%p Do Insert Element of %p <%s> into parent %p at offset %d\n",
this, nodeAsContent.get(), nodename,
parentAsContent.get(), mOffset);
nsMemory::Free(nodename);
}
#endif
if (!mNode || !mParent) return NS_ERROR_NOT_INITIALIZED;
nsCOMPtr<nsIDOMNodeList> childNodes;
nsresult result = mParent->GetChildNodes(getter_AddRefs(childNodes));
if (NS_FAILED(result)) return result;
nsCOMPtr<nsIDOMNode>refNode;
if (childNodes)
{
PRUint32 count;
childNodes->GetLength(&count);
if (mOffset>(PRInt32)count) mOffset = count;
// -1 is sentinel value meaning "append at end"
if (mOffset == -1) mOffset = count;
result = childNodes->Item(mOffset, getter_AddRefs(refNode));
if (NS_FAILED(result)) return result;
// note, it's ok for mRefNode to be null. that means append
}
mEditor->MarkNodeDirty(mNode);
nsCOMPtr<nsIDOMNode> resultNode;
result = mParent->InsertBefore(mNode, refNode, getter_AddRefs(resultNode));
if (NS_FAILED(result)) return result;
if (!resultNode) return NS_ERROR_NULL_POINTER;
// only set selection to insertion point if editor gives permission
PRBool bAdjustSelection;
mEditor->ShouldTxnSetSelection(&bAdjustSelection);
if (bAdjustSelection)
{
nsCOMPtr<nsISelection> selection;
result = mEditor->GetSelection(getter_AddRefs(selection));
if (NS_FAILED(result)) return result;
if (!selection) return NS_ERROR_NULL_POINTER;
// place the selection just after the inserted element
selection->Collapse(mParent, mOffset+1);
}
else
{
// do nothing - dom range gravity will adjust selection
}
return result;
}
NS_IMETHODIMP InsertElementTxn::UndoTransaction(void)
{
#ifdef NS_DEBUG
if (gNoisy) { printf("%p Undo Insert Element of %p into parent %p at offset %d\n",
this, mNode.get(), mParent.get(), mOffset); }
#endif
if (!mNode || !mParent) return NS_ERROR_NOT_INITIALIZED;
nsCOMPtr<nsIDOMNode> resultNode;
return mParent->RemoveChild(mNode, getter_AddRefs(resultNode));
}
NS_IMETHODIMP InsertElementTxn::GetTxnDescription(nsAString& aString)
{
aString.AssignLiteral("InsertElementTxn");
return NS_OK;
}